injectors
10-31-2008, 06:05 PM
#1
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injectors Who would have known injectors were so darn hard.
Its not just as simple as picking them out apparetly
The setup in my sig is still in pieces but "should" make around 410-430 rwhp in my awd truck which I would translate into 550ish horses (using 25% loss).. again just a guess. I think the standard radix deliphi 42lb injectors won't be able to keep up. This is my DD so I don't want to be on the ragged edge and I heard that I want my IDC to be below 80%. Using the est 550hp and .65bsfc on the fuel injector calculator in the stick I cam out with 90%IDC
So far my options seam to be 60 motrons, ractronix... I've been told there are some 50lb ls2 injectors that may work. The truck has the short injectors a different connector but I can just space the rail and soldier on different connectors
My questions is what would you suggest as I've heard problems with some injectors being too slow, some just being smaller injectors drilled out and fail, others that just don't atomize well at low rpms and idle.
Its not just as simple as picking them out apparetly
The setup in my sig is still in pieces but "should" make around 410-430 rwhp in my awd truck which I would translate into 550ish horses (using 25% loss).. again just a guess. I think the standard radix deliphi 42lb injectors won't be able to keep up. This is my DD so I don't want to be on the ragged edge and I heard that I want my IDC to be below 80%. Using the est 550hp and .65bsfc on the fuel injector calculator in the stick I cam out with 90%IDC
So far my options seam to be 60 motrons, ractronix... I've been told there are some 50lb ls2 injectors that may work. The truck has the short injectors a different connector but I can just space the rail and soldier on different connectors
My questions is what would you suggest as I've heard problems with some injectors being too slow, some just being smaller injectors drilled out and fail, others that just don't atomize well at low rpms and idle.
Last edited by PSM; 11-02-2008 at 08:29 AM.
10-31-2008, 09:25 PM
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I would like to see these "drilled out" injectors that fail, as most injectors from the same company all have the same part # for the coil and all internals other than the discharge plate.
The trucks can be tricky to get injectors for. the 60lb Siemens Dekkas would be a good option, although you would have to get spacers for them to fit.
Going with modified EV14 Bosch injectors (LS2 LS3 LS7 style) would be a good alternative. Just use a 3/8 spacer and the wiring harness adapters. I can do the LS2's in 50lb for $35 each, flow matched, viton o-rings installed, and a 3 year no questions warranty.
The trucks can be tricky to get injectors for. the 60lb Siemens Dekkas would be a good option, although you would have to get spacers for them to fit.
Going with modified EV14 Bosch injectors (LS2 LS3 LS7 style) would be a good alternative. Just use a 3/8 spacer and the wiring harness adapters. I can do the LS2's in 50lb for $35 each, flow matched, viton o-rings installed, and a 3 year no questions warranty.
11-02-2008, 12:25 AM
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Are both those flow rates @ 3bar or 4bar? After talking to you on the phone and seeing your video's on youtube you seam to know your injectors!
Those Bosch injectors really seamed to atomize the fuel well. Would you recommend them over the 60lb siemens?
If those 50 lb ls2's are for sale for $35 a piece you shall be getting a call then!
Those Bosch injectors really seamed to atomize the fuel well. Would you recommend them over the 60lb siemens?
If those 50 lb ls2's are for sale for $35 a piece you shall be getting a call then!
11-02-2008, 03:56 AM
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The Design III's are an impressive injector, the EV14 (LS2) style atomize just as well too.
I highly recommend the Design III Bosch, but the only drawback is that they don't come in that large of a size.
The Siemens 60's are rated at 3 bar, the LS2 is rated at 4 bar. Doing the math for your HP levels (using a .6 bsfc, .9 is a TON, usually reserved for an N/A car on pure methanol) I'm coming up with needing a 51lb injector to get you an 80% duty cycle. So our modified LS2's would fit the bill perfectly.
Give me a call tomorrow if you want to talk more about it. 727-207-0198
~Rich
I highly recommend the Design III Bosch, but the only drawback is that they don't come in that large of a size.
The Siemens 60's are rated at 3 bar, the LS2 is rated at 4 bar. Doing the math for your HP levels (using a .6 bsfc, .9 is a TON, usually reserved for an N/A car on pure methanol) I'm coming up with needing a 51lb injector to get you an 80% duty cycle. So our modified LS2's would fit the bill perfectly.
Give me a call tomorrow if you want to talk more about it. 727-207-0198
~Rich
11-02-2008, 08:52 AM
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Ops I meant to say I used .65 for bsfc
If I use some website calculators the 42lbers I have now actually flow about 50lb/hr under the 4 bar rail so those ls2 injectors don't look like they really give me much.
Over on PT.net there is a guy running the almost the same motor/blower/cam (identical except I have the 90mm Tbody mod) combo as me and he was at 100% IDC with his 42's. So that leads me to believe I need a good bit more injector. He put down 440rwhp through a 2wd 4l80 so I would assume that he has a 25% loss. Then add in my 90 Tbody and that may add 20ish rwhp and then that puts me at about 575+ crank hp. I'm am just guessing on what power I am making here so this is all a crap shoot.
Also I've heard above 5500 rpm the IDC starts to shoot up quick because the time the injectors have to squirt in the fuel is getting much shorter.
If I use some website calculators the 42lbers I have now actually flow about 50lb/hr under the 4 bar rail so those ls2 injectors don't look like they really give me much.
Over on PT.net there is a guy running the almost the same motor/blower/cam (identical except I have the 90mm Tbody mod) combo as me and he was at 100% IDC with his 42's. So that leads me to believe I need a good bit more injector. He put down 440rwhp through a 2wd 4l80 so I would assume that he has a 25% loss. Then add in my 90 Tbody and that may add 20ish rwhp and then that puts me at about 575+ crank hp. I'm am just guessing on what power I am making here so this is all a crap shoot.
Also I've heard above 5500 rpm the IDC starts to shoot up quick because the time the injectors have to squirt in the fuel is getting much shorter.
11-02-2008, 09:50 AM
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Alright, how about this, I have brand new LS2's in 52lb at 3 bar, so they flow 60 at 4 bar.
I can do those for $55 each, and they will work great in your application.
I can do those for $55 each, and they will work great in your application.
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11-02-2008, 08:55 PM
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That is s nice program you have there!
With the GT2-3 cam I would think my peak power would be at 5500 rpm atleast and say I get a peak power of 575 horse.. how would that affect it?
The other thing is that that other guy with my setup maxed out his at 100% so maybe there are other variables or i will be infact making more than 550?
With the GT2-3 cam I would think my peak power would be at 5500 rpm atleast and say I get a peak power of 575 horse.. how would that affect it?
The other thing is that that other guy with my setup maxed out his at 100% so maybe there are other variables or i will be infact making more than 550?
11-02-2008, 10:39 PM
#10
That is s nice program you have there!
With the GT2-3 cam I would think my peak power would be at 5500 rpm atleast and say I get a peak power of 575 horse.. how would that affect it?
The other thing is that that other guy with my setup maxed out his at 100% so maybe there are other variables or i will be infact making more than 550?
With the GT2-3 cam I would think my peak power would be at 5500 rpm atleast and say I get a peak power of 575 horse.. how would that affect it?
The other thing is that that other guy with my setup maxed out his at 100% so maybe there are other variables or i will be infact making more than 550?
Note: The minimum injector size is for injectors that are rated at 3 bar.
Another excellent choice if you choose to go with a different injector is the FAST 30572-8. It's a direct fit for your application, physically, and is 57 lb/hr @ 4 bar. Using the same data above but changing the injector rated pressure to 4 bar would net a minimum injector size of 53.91 lb/hr @ 4 bar. The FAST injectors are slightly larger to provide some room for error and growth.
Good luck on your combination!
Last edited by 405HP_Z06; 11-02-2008 at 11:11 PM.
11-03-2008, 04:19 PM
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Another excellent choice if you choose to go with a different injector is the FAST 30572-8. It's a direct fit for your application, physically, and is 57 lb/hr @ 4 bar. Using the same data above but changing the injector rated pressure to 4 bar would net a minimum injector size of 53.91 lb/hr @ 4 bar. The FAST injectors are slightly larger to provide some room for error and growth.
Good luck on your combination!
Do I have the same length injectors as ls2's? I though my odd truck ones were between ls1 and ls2 length?
